From Longman Dictionary of Contemporary Englishlive in phrasal verb British EnglishLIVE SOMEWHEREif someone lives in, they live in the place where they work → live-in Sometimes it can be easier if you have a nanny who lives in. → live→ See Verb tablelive-inlive-in /ˈlɪv ɪn/ adjective [only before noun] 1 LIVE SOMEWHEREa live-in job is one in which you live with the family you work for a live-in nanny2 → live-in lover/boyfriend etc
Examples from the Corpus
live-in• She met her live-in boyfriend on-line.• Only 3 percent report using baby-sitters in their homes, a tiny percentage of which are live-in nannies.• We have a live-in nanny and she is technically on duty from the time we leave the house.• Neither daughter can take care of their father, and he rejected the idea of a live-in nurse.• For a start, it's a live-in position. 